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Comptes Rendus de l’Académie des Sciences - Series IIA - Earth and Planetary Science July 2001; 333(2) : 133-139
Archimer http://www.ifremer.fr/docelec/ Archive Institutionnelle de l’Ifremer
http://dx.doi.org/10.1016/S1251-8050(01)01606-8 © 2001 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS. All rights reserved
New modelling of submarine gravity flows: application to the Nice collapse in 1979 Alexandre Hugota*, 1,Philippe Josepha, Bruno Savoyeb and Stéphane Zaleskic a
Institut français du pétrole, division « Géologie–géochimie », 1–4, av. de Bois-Préau, 92852 Rueil-Malmaison cedex, France b Institut français de recherche pour l'exploitation de la mer, laboratoire «Environnements sédimentaires », BP 70, 29280 Plouzané cedex, France c Laboratoire de modélisation en mécanique, université Pierre-et-Marie-Curie, tour 66, 4, place Jussieu, 75252 Paris cedex 05, France *: Corresponding author :
[email protected]
Abstract: We propose to apply in this note a simple mathematical model for the sedimentation of gravity deposits in deep water. An inverse method has been developed in order to characterize the parameters associated with the submarine flow. This method also provides the initial conditions, which constitute a major uncertainty in geoscience modelling. Application of the inverse method to the 1979 Nice airport collapse (southern France), constrained by cable breaks and/or deposit thicknesses, leads, for example, to the estimation of the initial volume and/or the physical parameters of the flow (friction coefficient, modified turbulent Schmidt number, etc.). The application of the model to this real case shows that only the simultaneous inversion of dynamic (cable break times) and sedimentological (deposit) data allows a satisfactory reconstruction of the flow. Keywords: gravity flow; turbidity current; flow object; inverse problem; 1979 Nice airport collapse; France
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